Protractor.



Patented m I, 1902.

INVENTOR.

w k w g k v W. HUAYLE.

PROTRACTDR (Application filed Sept. 1901.

'( l|o Model.)

UNn D STATES PATENT OFFICE.

WVILLIAM QUAYLE, OF DENVER, COLORADO, ASSIGNOR TO JOSEPH H. HARRISON ANDMEYER HARRISON, OF DENVER, COLORADO.

PROTRACTO R.

SPECIFICATION formingpart of Letters Patent No. 703,608, dated July 1,1902.

Application filed September 9, 1901. Serial No. 74,861. (No model.)

To all whmn it may concern:

Be it known thatI, WILLIAM QUAYLE, a citizen of the UnitedStatesofAmerica, residing at Denver, in the county of Arapahoe and State ofColorado, have invented certain new and useful Improvements inProtractors;

and I do declare the following to be a full, clear, and exactdescription of the invention,

such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to the characters of reference marked thereon, which form a part ofthis specification.

My invention relates to improvements in protractors or bevels providedwith an anglemeasure and a vernier,my object being to provide aninstrument of this class which shall be simple in construction,economical in cost, reliable, durable, and efficient in use; and tothese ends the invention consists of the features, arrangements, andcombinations hereinafter described and claimed, all of which will befully understood by reference to the accompanying drawings, in which isillustrated an embodiment thereon. 1

In the drawings, Figure l is a top or plan view of myimproved instrumentbroken away intermediate its extremities for lack ofspaceon the sheet.the same. partly in horizontal section, taken on the line 00 at, Fig. 5.Fig. 4 is a similar view, the section being taken just below thewasher,which Fig. 2 is a side or edge view of is cut in the precedingview. Fig. 5 is a section taken on the line 1/ U Fig. 1, the parts beingshown on a larger scale.

The same reference characters indicate the same parts in all the views.

Let the numerals 5 and 5, respectively,designate the two main arms ormembers of the instrument. The extremity of the member 5 is providedwith an opening, in which is inserted the base 6 of a screw-stud 6. Thisbase is provided with a bottom flange 6, which is countersunk in themembero. The base 6 also passes through an opening formed in a metalplate 7, whose opposite extremity is se-. cured to the member 5 by meansof suitable fastening devices 8.

Fig. 3 is a-fragmentary top View,

Projecting from the extremity of the plate 7, which is attached to themember 5 is a graduated quadrant 7 The are of this quadrant forms a partof a circle whose center is the center of the stud 6, with which the arm5 is connected.

The quadrant projects toward and overlaps the member 5 of the devicewhen the instrument is closed, as shown in Fig. 1 of the drawlngs.

Surrounding, the shank 6 of the stud 6 is one extremity of a bifurcatedarm 9, which is made fast to the base of the stud at the top by means ofscrews 10 or other suitable fastening devices. To the opposite extremityof this bifurcated arm is attached a Vernier 12, which is curved toconform to the curve of the quadrant and engages or occupies a positionin suitable proximity to the outer edge of the same. The Vernier lies inthe same plane as the quadrant and turns with the arm 5 and the stud 6.

Located above the inner extremity of the bifurcated Vernier-arm is awasher 13,which engages the member 5 and surrounds the extremity of thearm 9. The washer is centrally recessed on the under side to make roomfor the protruding heads ofthe screws 10. The washer is also providedwith recesses on its under side adapted to receive the respectivemembers of the bifurcated vernier-arm,which fit the said recesses.

To the top of the stud-shank 6, which is threaded for the purpose, isapplied a nut 1a, which looks the stud 6, the member 5, the Vernier-arm9, and the washer 13 together. When the member 5is turned, all of thesaid parts turn with it. The stud turns in the plate 7, which is madefast to the member 5, as aforesaid.

Each member 5 and 5of the device is provided with a scale for measuringrelative dimensions. I g

The arm 5 is provided with an adjustable screw-pin 15, which protrudesfrom its inner 9 edge and is engaged by the arm 5 when the two arms areparallel.

From the foregoing description the use of the instrument will be readilyunderstood by those accustomed to handle instruments of its class. Oneof the main arms, as 5, is placed against a square or straight-edge as abase, while the arm 5 is moved outward to form any desired angle orpitchwith the base, as indicated by the vernier on the scale of angles andpitches. Arms 5 and 5 are quickly adjusted when the clam ping-screw 14is loosened and may be placed at any desired angle with respect to eachother, between zero and ninety'degrees. Another feature of the deviceconsists of a scale of roof-pitchesas one-half, one-third, one-fourth,&c.-formed upon the quadrant 7. This scale of pitches is a convenience,and the use of the instrument with reference to it is the same asheretofore described when describing the manner of measuring angles. Oneof the main arms being on a straigl1t-edge or base, the other is movedoutward therefrom until the vernier indicates the pitch required-asone-half, onethird, one-fourth, or anyotherdesired pitchthe scale shownon the drawings ranging from one-half to one-sixth. The arm 5 and thescrew-stud are clamped tightly together by the cooperation of the bottomflange 6 of the stud and the nut screwed upon the threaded shank of thestud. The flange 6 is provided with brads A, which enter counterpartrecesses formed in the member 5, thus causing the two parts to move inunison.

Having thus described my invention, what I claim is- 1. The combinationof two main arms or members, a plate made fast to one arm and extendingtherefrom, the opposite extremity of the plate being provided with anopening registering with an opening formed in the other member, ascrewstud having an enlarged base inserted in the registering openings,the base of the screw-stud having a bottom flange engaging a recessformed in the member through which it passes, the plate being providedwith a quadrant which extends toward the member connected with thescrewstud, a vernier-arm through which the shank of the screw-studpasses, the vernier-arm being made fast to the base of said stud, thevernier being arranged in suitable proximity to the graduated edge ofthe quadrant, and a nut applied to the threaded shank of the stud,whereby the stud and the member through which its base passes, areclamped together for the purposeset forth.

2. The combination of two arms or members, a plate made fast to one armand extending therefrom, the opposite extremity of the plate beingprovided with an opening registering with an opening formed in the othermember, a screw-stud inserted in the registering openings, a vernier-armmade fast to said screw-stud, a quadrant connected with the plate, thequadrant and vernier being arranged in suitable proximity to each other;the Vernier-arm, the screw-stud and the arm through which it passesbeing arranged to move together when the other member or arm isrelatively stationary, and suitable means for locking the parts in anydesired position of adjustment.

3. The combination of two arms or members, a plate made fast to one armand extending therefrom, the opposite extremity of the plate beingprovided with an opening registering with an opening formed in the othermember, a screw-stud having an enlarged base inserted in the registeringopenings, the plate being provided with a quandrant which extends towardthe member connected with the screw-stud, the base of the screw-studhaving a bottom flange engaging a recess formed in the member throughwhich it passes, a vernier-arm through which the shank of the screw-studpasses, the said arm being made fast to the base of the stud, thevernier being arranged to move around a center common to the arc of thequadrant, and arranged to travel in the plane of and in suitableproximity to the quadrant, and a nut applied to the threaded shank ofthe stud whereby the stud and the member through which the base passes,are clamped together for the purpose set forth.

4. In an instrument of the class described, the combination of two mainarms 5 and 5, a plate made fast to the arm 5 and provided with anopening registering with the opening in the arm 5, a screw-stud insertedin the said registering openings, a vernier-arm applied to said stud andmade fast thereto, a vernier attached to said arm, a quadrant connectedwith the plate adjacent the vernier, a washer applied to the stud abovethe vernier-arm, and recessed to receive the same, and a nut applied tothe stud above the washer, substantially as described.

5. In an instrument of the class described, the combination of two mainarms or members, a plate-made fast to one arm and extending therefrom,the opposite extremity of the plate being provided with an openingregistering with an opening formed in the other member, a screw-studhaving an enlarged base inserted in the registering openings, the baseof the stud having a bottom flange engaging a circular recess or grooveformed in the member through which it passes, the plate being providedwith a quadrant which extends toward the member connected with thescrew-stud, a vernier-arm through which the shank of the screw-studpasses, the said arm being made fast to the base of the stud, thevernier being arranged to travel in suitable proximity to the graduatededge of the quadrant, a washer applied to the stud above thevernier-arm, and recessed to receive the latter, and a nut applied tothe stud above the washer, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

\VILLIAM QUAYLE.

Witnesses:

DENA NELsoN, MARY C. LAMB.

